Diffusion of low energy cosmic rays - Evidence of strong spatial inhomogeneities

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Rays, Interstellar Matter, Particle Diffusion, Particle Energy, Spatial Distribution, Diffusion Coefficient, Galactic Evolution, Galactic Radiation, Inhomogeneity, Nucleons, Supernovae

Scientific paper

A self-consistent study of the diffusion of low-energy cosmic rays (less than 100 MeV) is performed in which the diffusion coefficient is assumed to depend on the energy per nucleon according to a square-root law. The basic process is found to be a decrease in the energy due to ionization of interstellar matter during the propagation of the nuclei. As a result, a strong correlation is found between the evolution of the nuclei in their energy space and their spatiotemporal kinetics. Assuming that the cosmic rays are generated by discrete sources (supernovae), it is shown that the spatial distribution of cosmic rays of a given energy (including the lowest level leading to newly made interstellar matter) is strongly inhomogeneous over a length scale which characterizes the birth of supernovae in the Galaxy.

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